| 摘要 |
Provided is a drive device that detects individual variation in the injection amount of the fuel injection devices for each cylinder, and is able to adjust the injection pulse width and the current waveform applied to a solenoid so as to reduce the individual variation in the fuel injection devices. This fuel injection device has: a valve body (114), which closes a fuel passage by making contact with a valve seat (118), and opens the fuel passage by separating from the valve seat (118); and a magnetic circuit configured from a solenoid (105), a stationary core (107), a nozzle holder (101), a housing (103), and a movable element (102). This fuel injection device has a function whereby, when current is supplied to the solenoid (105), magnetic attractive force operates on the movable element (102) and the movable element runs freely and collides with the valve body (114), thereby opening the valve body (114). The change in the acceleration of the movable element (102) caused by the collision of the movable element (102) with the valve body (114) is detected from the current flowing in the solenoid (105). |
